Sound recording and reproducing machine



March 17, 1925. 1,530,413

H. A. ROGERS SOUND RECORDING AND REPRODUCING MACHINE Filed Sept. 19, 1924 2 Sheets-Sheet l "215' vwento@ @Vom/1 a1,

Marh `1 7,-'1 925. 1,530,413

H. A. ROGERS SOUND RncoRDING AND REPRODUCING MACHINE Manne/yg Z WW this control wheel passes across they recordl Patented Mar. 17, 1925.,

UNITED; STATES;

. HAR-OLD Anrnnn imanes,l for Giannini, wenns.

sofUNn RECORDING AND nnrnonUoiNc-i MACHINE.

Application Vfiled 'September T 0 all w/iomczf may concern:

Be. it known that I, HAROLD ALFRED Roenes, a subject of the King of Great Britain.

and Ireland, of 56 New Zealand Road', Cardiff, lvales, have.invented-certain new and useful Improvements in or Relating to `Sound Recording and Reproducing Machines, of which the following is a specification. J

This invention relates to iiiiprovements in f or relating to sound recording and reproduc ing machines andin particular to improved means for controlling the speed ofthe turn'-, table'so that when desired the turntable may be caused or allowed torun at an increasing angular speed as the needle passes across kthe record from the outside towards the centre.

In previously known constructions directed to this object it has been proposedto use a inotor running at a constant angular speed but with a variable transmission between the motor and the turntable.y In seine cases the motor drives at a constant angular speed a frictionpulley which'passes across the turntable or across a separate disc on the turntable spindle. In other known constructions it has been proposed to have a speed control friction wheel running on the turntable or on the record and in gear withv a vgovernor which allows the control wheel to run only at a constant angular speed. As

towards the centre of the turntable it allows thel turntable and consequently the motor to increase its angular speed of rotation.`

According to the present invention a speed control wheel connected with'tlie governor which allows it to run at a constant angular speed is mounted to eo-operate with a separate friction disc geared to the'rnotor or turntable spindle and this control wheel is caused to travel acrossy the friction disc by being suitably connected with al travelling part of the machine such as the sound arm.

, The friction disc being geared .with the motor, the variationy in speed of the friction disc permitted by the travelling rcontrol wheel causes a proportionate variation in .speed of the turntable.

The invention is illustrated in the accompanying drawings in which- Fig. l is an underside plan view vof a spring motor to which the present inven-v tion is applied, Y Y y Fig. 2 isa side elevation of theA same,

i9, i924. serial, No. 738,625.

lFig. 3 is a side elevation at right angles ytoFig. 2,-

Fig. 4 is aside view on an enlarged scale ofthe `governor andthe preferred vforni of mounting.

Referring to Figs. 1, 2 and 8, the spring vdruin'26 carries a gear wheel 28 engaging with a worin on the turntable spindle 24 carrying the turntable .27. yMounted on the spindle 2li is a' worin wheel 29 whichdrives N the shaftv 30 carrying a friction disc 25. The friction disc 25J and the spindle 8C)l occupy the position usually occupied by the governor and ,governor spindle of atalking nia-f ing supported upon a track Z19. The speed 0f the centrifugal governor is determined y in the usual manner by means of a friction pad engaging with a friction disc mounted y on the sliding collar 38 of the governor.

The rod 33 is connected to the sound arm' for example,l of the talking machine by means of a shaft 46 havinggears at its ends, onenieshing 4with the teeth of a sector d? moving with said sound arm, and the other meshing with teeth on arack`118 formed at the end of saidv rod. The-object of this conniection is to cause the rod 33 to be moved .end-ways as the sound arm moves across the record with the result that the controll wheel 18 moves across the disc 25 thus allowing the disc 25 andl consequently the motor to increaselits angular speed. It is apparent that the connecting means here shown and described for transmitting nio-tion from the sound arm tothe rod 83 arel merely illustrative of any of a range of well'known inei chanical equivalents which may be yutilized for this purpose.

As shownin Fig. l the governor spindle 31 is preferably mounted at either 'end in self-aligning'ball bearings carried by` the Between the fixed col-y governor carriage. lar- 37 and the sliding collar 38 are fixed ,spring blades 'which carry weights 32 in the form of discs lying substantially at right angles to the blades. Thespring blades pass through slots 39 in the friction disc attached to the slidingcollar 38. rThe rim of the control Wheel 18 is of lnetal preferably steel or brass with a tyre of fibre, rubber or other gripping or non-slipping material wherein the teeth for engaging with the Worin 35 are deeply cut.

I claim:

l. In a sound recording or reproducing machine, a turntable, a motor for operatingthe saine, a sound arin movable from the periplieral portion of said turntable toward the center thereoic by co-action with a record, means for varying the angular speed of rotation of the turntable comprisinga friction disll positively driven by the motor, a governor, a speed control Wheel operatively connected to said governor and governed thereby, and means operated by the. 1novement of the sound arm across the record for producing a rectilinear movement ot' said ord, means for varying the angular speed of rotation of the turntable comprising a 'friction disk positively driven by the inotor, a `governor, a speed control Wheel operatively connected to said governor and governed thereby, and rectilinearly inovable means responsive to movement of the sound y arm across the record for moving, said control Whcel across the face of said friction disk, said governor being carried by and Inova-ble with said means. t

In testimony whereof I have signed iny naine to this specification.

` HAROLD ALFRED Roenes. 

